ESXi includes a unique keystroke sequence that allows dynamic serial mode switching.

Once the correct keystroke sequence is entered, the system switches the serial port to the desired mode.

Logging mode: Ctrl+G, Ctrl+B, 1

Shell mode: Ctrl+G, Ctrl+B, 2

DCUI mode: Ctrl+G, Ctrl+B, 3

GDB mode: Ctrl+G, Ctrl+B, ?

Note

Once in GDB mode, you cannot switch modes again using a key sequence. You must use the CLI to switch modes.